CN107580344B

CN107580344B - Method, device and system for switching user terminal

Info

Publication number: CN107580344B
Application number: CN201710800826.XA
Authority: CN
Inventors: 许朝; 谢人超; 董红
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-09-07
Filing date: 2017-09-07
Publication date: 2021-07-20
Anticipated expiration: 2037-09-07
Also published as: CN107580344A; WO2019047706A1

Abstract

The application provides a method, a device and a system for switching a user terminal, relates to the technical field of communication, and can reduce the number of request transmission times and waiting time delay. The method comprises the following steps: receiving switching information sent by a target UAP, wherein the switching information is used for requesting to switch UE to the target UAP; acquiring information of a first interest packet according to the switching information, wherein the information of the first interest packet comprises a content name of the first interest packet and user information of the UE, and the first interest packet is an interest packet which is sent by the UE to an original UAP connected with the UE and is not responded; and sending interest package information to a target UAP, wherein the interest package information comprises a content name and user information of a first interest package, and the interest package information is used for the target UAP to modify a first to-be-determined interest table PIT stored in the target UAP, so that after receiving a data package requested by the first interest package, the UAP sends the data package to the UE according to the modified first PIT.

Description

Method, device and system for switching user terminal

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for switching a User Equipment (UE).

Background

A Named Data Networking (NDN) is a content-centric mobile network that supports name routing. Network nodes in the NDN may cache packet contents. The UE requests a Data Packet (Data Packet) corresponding to the content name by transmitting an Interest Packet (Interest Packet) to a network node connected thereto.

Fig. 1 is a schematic diagram of an NDN topology. The network node S is a content source and is configured to send a corresponding data packet according to the received interest packet. Network nodes N1 and N3 are requesting nodes for the UE to access the network. Network nodes N2, N4, and N5 are forwarding nodes for forwarding interest packets as well as data packets. When connected with N1, the UE sends an interest packet to N1 to request a corresponding data packet. After receiving the interest packet, N1 forwards the interest packet along the path from N1, N2, N5 to S. And when the S receives the interest packet, returning the corresponding data packet to the UE along the original path. When the UE sends the interest packet to N1, but before receiving the data packet requested by the interest packet, the UE moves to N3 and establishes connection with N3, that is, the UE is switched. The UE needs to resend the interest packet to N3 and request the corresponding data packet again through N3.

In the above procedure, when the UE is switched, the UE needs to make a secondary request for each interest packet that does not receive a response. Since each request needs a certain period of time to be responded, it is difficult to satisfy the service requirement of the UE for real-time communication service.

Disclosure of Invention

The application provides a method, a device and a system for switching UE, which can reduce the request transmission times and the waiting time delay.

In a first aspect, the present application provides a method for UE handover, including: a first mobile control center MCC receives switching information sent by a target User Attachment Point (UAP), wherein the switching information is used for requesting to switch UE to the target UAP, and the target UAP is controlled by the first MCC; the first MCC acquires information of a first interest packet according to the switching information, wherein the information of the first interest packet comprises a content name of the first interest packet and user information of the UE, and the first interest packet is an interest packet which is sent by the UE to an original UAP connected with the UE and is not responded; the first MCC sends interest package information to the destination UAP, the interest package information comprises the content name of the first interest package and the user information, and the interest package information is used for the destination UAP to modify a first pending interest table PIT stored in the destination UAP, so that after receiving a data package requested by the first interest package, the UAP sends the data package to the UE according to the modified first PIT.

By adopting the method for switching the UE, in the switching process of the UE, the first MCC can acquire the content name of the first interest packet which is requested by the UE but is not responded, and then the content name of the first interest packet and the user information of the UE are sent to the target UAP through the interest packet information for changing the PIT of the target UAP, so that the target UAP can return the data packet to the UE after receiving the data packet requested by the first interest packet. Without the UE making a secondary request for the first interest package. Therefore, the request transmission times and the waiting time delay are reduced, and the data request efficiency of the UE in the switching process is improved.

Optionally, the switching information includes user information and a switching instruction, the UAP is controlled by a first MCC, and the first MCC obtains information of the first interest packet according to the switching information, including: the first MCC determines the original UAP according to the user information; the first MCC sends the switching indication information to the original UAP, wherein the switching indication information comprises the switching instruction and the user information, so that the original UAP determines the information of the first interest packet corresponding to the user information according to the switching instruction; the first MCC receives the information of the first interest package sent by the original UAP.

Optionally, after the first MCC sends the interest packet information to the destination UAP, the method further includes: and the first MCC sends disconnection information to the original UAP, wherein the disconnection information is used for indicating the original UAP to disconnect the UE.

The two optional modes describe a specific process of performing intra-domain switching by the UE, and after the target UAP completes switching, the first MCC can directly inform the original UAP port of connection with the UE, so that the situation that the connection between the UE and the original UAP continuously occupies connection resources of the original UAP after switching is avoided.

Optionally, the switching information includes user information and a switching instruction, the UAP is controlled by the second MCC, and the first MCC obtains information of the first interest packet according to the switching information, including: the first MCC determines the second MCC according to user information; the first MCC sends the switching indication information to the original UAP via the second MCC, the switching indication information including the switching instruction and the user information, so that the original UAP determines the information of the first interest packet corresponding to the user information according to the switching instruction; the first MCC receives the information of the first interest package sent by the original UAP through the second MCC.

Optionally, the method further includes: and the first MCC sends disconnection information to the original UAP through the second MCC, wherein the disconnection information is used for indicating the original UAP to disconnect the UE.

The two optional modes describe a specific process of the UE for cross-domain switching, and after the target UAP completes switching, the first MCC can inform the connection between the original UAP port and the UE by controlling the second MCC of the original UAP, so that the connection between the UE and the original UAP continuously occupies the connection resource of the original UAP after switching.

Optionally, the disconnection information further includes forwarding information, and the forwarding information is used for the original UAP to modify a second PIT stored in the original UAP.

Through the optional mode, the second PIT of the original UAP is modified through the forwarding information, so that when the data packet reaches the original UAP, even if the UE is switched, the original UAP can smoothly return the data packet to the UE according to the modified second PIT, the data interruption of the UE in the switching process is avoided, and the seamless switching is realized.

Optionally, the method further includes: the first MCC determines a transmission path for transmitting the data packet to a destination UAP; the first MCC sends first modification information to the first content router CR on the transmission path, where the first modification information is used to instruct the first CR to modify a third PIT stored in the first CR, so that the first CR sends the received data packet to the destination UAP according to the modified third PIT.

Optionally, after the original UAP is controlled by the second MCC and the first MCC determines a transmission path for transmitting the data packet to the destination UAP, the method further includes: the first MCC sends second modification information to the first content gateway CGW on the transmission path, where the second modification information is used to instruct the first CGW to modify a fourth PIT stored in the first CGW, so that the first CGW sends the received data packet to the first CR according to the modified fourth PIT.

By these two alternatives, the first MCC determines a transmission path capable of transmitting the data packet to the destination UAP, and modifies the PIT of each network element on the transmission path. Ensuring that the destination UAP can receive the data packet and then send the data packet to the UE.

Optionally, after the first MCC sends the interest packet information to the destination UAP, the method further includes: the first MCC receives feedback information sent by a target UAP, wherein the feedback information is used for indicating whether the first PIT before modification has the content name of the first interest packet or not and whether the target UAP has the cached data packet or not; the first MCC determining a transmission path for transmitting the data packet to the destination UAP, comprising: the first MCC determines the transmission path when it is determined that the feedback information indicates that the content name of the first interest packet does not exist in the first PIT before modification and the data packet is not buffered in the destination UAP.

Through the optional mode, the processes of topology calculation and path calculation of the first MCC under the condition of not determining a transmission path are avoided, and therefore the switching efficiency is improved.

In a second aspect, the present application provides a method for UE handover, including: the second MCC receives the forwarding information sent by the first MCC; and the second MCC sends third modification information to the second CR according to the forwarding information, wherein the third modification information is used for the second CR to modify a fifth PIT stored in the second CR, so that the second CR sends the received data packet requested by the first interest packet to the first CR or the second CGW according to the modified fifth PIT, the first CR is controlled by the first MCC, and the second CR and the second CGW are controlled by the second MCC.

Optionally, the modified fifth PIT is configured to instruct the second CR to send the received data packet requested by the first interest packet to the second CGW, and the method further includes: and the second MCC sends fourth modification information to the second CGW according to the forwarding information, wherein the fourth modification information is used for modifying a sixth PIT stored in the second CGW by the second CGW, so that the second CGW sends the received data packet requested by the first interest packet to the first CGW according to the modified sixth PIT.

Optionally, the method further includes: and the second MCC sends fifth modification information to the original UAP according to the forwarding information, wherein the fifth modification information is used for modifying the second PIT by the original UAP so that the original UAP sends the received data packet requested by the first interest packet to the second CR according to the modified second PIT.

Optionally, before the second MCC receives the forwarding information sent by the first MCC, the method further includes: the second MCC receives switching indication information sent by the first MCC, wherein the switching indication information comprises a switching instruction and user information of the UE; the second MCC determines the original UAP connected with the UE according to the user information; the second MCC sends the switching indication information to the original UAP; the second MCC receives the information of a first interest packet sent by the original UAP, wherein the first interest packet is an interest packet which is sent by the UE to the original UAP and is not responded; the second MCC sends the interest package information to the first MCC;

optionally, the receiving, by the second MCC, forwarding information sent by the first MCC includes: the second MCC receives disconnection information sent by the first MCC, the disconnection information is used for indicating the original UAP to disconnect the UE, and the disconnection information comprises the forwarding information; the second MCC sends the disconnection information to the original UAP.

In a third aspect, the present application provides a method for UE handover, including: when a target User Attachment Point (UAP) detects that the signal intensity of UE is greater than or equal to a preset threshold value, the target UAP sends switching information to a first Mobile Control Center (MCC), wherein the switching information is used for requesting to switch the UE to the target UAP, and the target UAP is controlled by the first MCC; the target UAP receives interest package information sent by the first MCC, the interest package information comprises a content name of a first interest package and user information of the UE, and the first interest package is an interest package which is sent by the UE to the original UAP connected with the UE and is not responded; and the destination UAP modifies a first to-be-determined interest table PIT stored in the destination UAP according to the interest packet information, so that when the destination UAP receives a data packet requested by the first interest packet, the destination UAP sends the data packet to the UE according to the modified first PIT.

Optionally, the first PIT includes a first local PIT and a first user pending interest table U-PIT, where the first local PIT is used to record a correspondence between a content name of an interest packet that the destination UAP does not respond to and a transmission port, and the first U-PIT is used to record a correspondence between user information and a content name of an interest packet that the destination UAP does not respond to.

Optionally, after the destination UAP modifies the first PIT stored in the destination UAP according to the information of the first interest packet, the method further includes: the destination UAP sends feedback information to the first MCC, where the feedback information is used to indicate whether the first PIT before modification has a content name of the first interest packet, and whether the destination UAP has the data packet cached therein.

In this alternative, the destination UAP may be used by the first MCC to decide whether to determine the transmission path by sending feedback information to the first MCC. Therefore, the processes of topology calculation and path calculation are avoided when the first MCC is not required to determine a transmission path, and the switching efficiency is improved.

In a fourth aspect, the present application provides a method for UE handover, including: an original User Attachment Point (UAP) receives switching information sent by a Mobile Control Center (MCC) for controlling the original UAP, wherein the switching information comprises a switching instruction and user information of User Equipment (UE), the switching information is used for requesting to switch the UE to a target UAP, and the original UAP is the UAP currently connected with the UE; the original UAP inquires a second to-be-determined interest table PIT stored in the original UAP according to the switching instruction, and determines the content name of a first interest packet corresponding to the user information, wherein the first interest packet is an interest packet which is sent to the original UAP by the UE and is not responded; and the original UAP sends information of a first interest package to the MCC, wherein the information of the first interest package comprises the content name of the first interest package and the user information.

By adopting the method for switching the UE, in the switching process of the UE, the original UAP determines the content name of the first interest packet which is not responded by the UE under the indication of the first MCC, and the content name is sent to the first MCC through the information of the first interest packet. And the first MCC sends the content name of the first interest package and the user information of the UE to the target UAP through the interest package information to change the PIT of the target UAP, so that the target UAP can return the data package to the UE after receiving the data package requested by the first interest package. Without the UE making a secondary request for the first interest package. Therefore, the request transmission times and the waiting time delay are reduced, and the data request efficiency of the UE in the switching process is improved.

Optionally, the second PIT includes a second local PIT and a second user pending interest table U-PIT, where the second local PIT is used to record a correspondence between a content name of an interest packet that the original UAP does not respond to and a transmission port, and the second U-PIT is used to record a correspondence between user information and a content name of an interest packet that the original UAP does not respond to; the original UAP inquires a second interest table PIT to be determined stored in the original UAP according to the switching instruction, and determines the content name of a first interest packet corresponding to the user information, wherein the content name comprises the following steps: the original UAP searches the content name of the unresponsive interest packet corresponding to the user information of the UE in the second U-PIT; the original UAP determines that the content name of the unresponsive interest packet corresponding to the user information of the UE exists in the second local PIT, and the original UAP determines that the content name of the unresponsive interest packet corresponding to the user information of the UE is the content name of the first interest packet.

In this alternative way, more accurate information of the first interest package can be obtained.

Optionally, after the original UAP sends the information of the first interest packet to the MCC, the method further includes: the original UAP receives disconnection information sent by the MCC; and the original UAP disconnects the connection with the UE according to the disconnection information.

Through the optional mode, the situation that the connection between the UE and the original UAP continuously occupies the connection resource of the original UAP after the UE is switched can be avoided.

Optionally, the disconnection information further includes forwarding information, and after the original UAP receives the disconnection information sent by the MCC, the method further includes: and the original UAP modifies the second PIT according to the forwarding information, so that when the original UAP receives the data packet requested by the first interest packet, the original UAP sends the data packet to the destination UAP or a content router CR according to the modified second PIT, wherein the CR is positioned on a transmission path for transmitting the data packet to the destination UAP.

Through the optional mode, the original UAP can modify the second PIT according to the forwarding information, so that when the data packet reaches the original UAP, even if the UE is switched, the original UAP can smoothly return the data packet to the UE according to the modified second PIT, the data interruption of the UE in the switching process is avoided, and the seamless switching is realized.

A fifth aspect of the present invention is a first mobile control center MCC, comprising: a receiving unit, configured to receive switching information sent by a destination user attachment point UAP, where the switching information is used to request to switch a user equipment UE to the destination UAP, and the destination UAP is controlled by a first MCC; a processing unit, configured to obtain information of a first interest packet according to the switching information received by the receiving unit, where the information of the first interest packet includes a content name of the first interest packet and user information of the UE, and the first interest packet is an interest packet that is sent by the UE to an original UAP connected to the UE and is not responded to; and the sending unit is used for sending the interest package information to the destination UAP, wherein the interest package information comprises the content name of the first interest package and the user information, and the interest package information is used for modifying a first to-be-determined interest table PIT stored in the destination UAP by the destination UAP, so that after receiving the data package requested by the first interest package, the UAP sends the data package to the UE according to the modified first PIT.

Optionally, the switching information includes user information and a switching instruction, the original UAP is controlled by the first MCC, and the processing unit obtains information of the first interest packet according to the switching information, which specifically includes: determining the original UAP according to the user information; sending the switching indication information to the original UAP, wherein the switching indication information comprises the switching instruction and the user information, so that the original UAP determines the information of the first interest packet corresponding to the user information according to the switching instruction; and receiving the information of the first interest packet sent by the original UAP.

Optionally, the sending unit is further configured to send disconnection information to the original UAP after sending the interest packet information to the destination UAP, where the disconnection information is used to instruct the original UAP to disconnect from the UE.

Optionally, the switching information includes the user information and a switching instruction, the original UAP is controlled by the second MCC, and the processing unit obtains information of the first interest packet according to the switching information, which specifically includes: determining the second MCC according to the user information; sending the switching indication information to the original UAP through the second MCC, wherein the switching indication information comprises the switching instruction and the user information, so that the original UAP determines the information of the first interest packet corresponding to the user information according to the switching instruction; and receiving the information of the first interest packet sent by the original UAP through the second MCC.

Optionally, the sending unit is further configured to send disconnection information to the original UAP via the second MCC, where the disconnection information is used to indicate that the original UAP disconnects from the UE.

Optionally, the processing unit is further configured to determine a transmission path for transmitting the data packet to the destination UAP; the sending unit is further configured to send first modification information to the first content router CR on the transmission path, where the first modification information is used to instruct the first CR to modify a third PIT stored in the first CR, so that the first CR sends the received data packet to the destination UAP according to the modified third PIT.

Optionally, the original UAP is controlled by a second MCC, and the sending unit sends second modification information to the first content gateway CGW on the transmission path, where the second modification information is used to instruct the first CGW to modify a fourth PIT stored in the first CGW, so that the first CGW sends the received data packet to the first CR according to the modified fourth PIT.

Optionally, the receiving unit is further configured to receive feedback information sent by the destination UAP, where the feedback information includes a content name indicating whether the first interest packet exists in the first PIT before modification; the determining, by the processing unit, a transmission path for transmitting the data packet to the destination UAP specifically includes: determining the transmission path when it is determined that the feedback information indicates that the content name of the first interest packet does not exist in the first PIT before modification.

For technical effects of the first MCC provided by the present application, reference may be made to technical effects of the first aspect or each implementation manner of the first aspect, and details are not described here.

In a sixth aspect, the present application provides a second MCC, comprising: a receiving unit, configured to receive forwarding information sent by a first MCC; and the processing unit is configured to send third modification information to the second CR according to the forwarding information received by the receiving unit, where the third modification information is used for the second CR to modify a fifth PIT stored in the second CR, so that the second CR sends the received data packet requested by the first interest packet to the first CR or the second CGW according to the modified fifth PIT, the first CR is controlled by the first MCC, and the second CR and the second CGW are controlled by the second MCC.

Optionally, the modified fifth PIT is configured to instruct the second CR to send the received data packet requested by the first interest packet to the second CGW, and the second MCC further includes a sending unit, where the sending unit is configured to send fourth modification information to the second CGW according to the forwarding information, and the fourth modification information is used by the second CGW to modify a sixth PIT stored in the second CGW, so that the second CGW sends the received data packet requested by the first interest packet to the first CGW according to the modified sixth PIT.

Optionally, the sending unit is further configured to send fifth modification information to the original UAP according to the forwarding information, where the fifth modification information is used for the original UAP to modify the second PIT, so that the original UAP sends the received data packet requested by the first interest packet to the second CR according to the modified second PIT.

Optionally, the receiving unit is further configured to receive handover indication information sent by the first MCC, where the handover indication information includes a handover instruction and user information of the UE; the processing unit is also used for determining the original UAP connected with the UE according to the user information; the sending unit is also used for sending the switching indication information to the original UAP; the receiving unit is further configured to receive information of a first interest packet sent by the original UAP, where the first interest packet is an interest packet that is sent by the UE to the original UAP and is not responded to; and the sending unit is further used for sending the interest packet information to the first MCC.

Optionally, the receiving unit receives the forwarding information sent by the first MCC, and specifically includes: receiving disconnection information sent by the first MCC, wherein the disconnection information is used for indicating the original UAP to disconnect the UE, and the disconnection information comprises the forwarding information; and the sending unit is also used for sending the disconnection information to the original UAP.

For technical effects of the second MCC provided in the present application, reference may be made to technical effects of the second aspect or each implementation manner of the second aspect, which are not described herein again.

In a seventh aspect, the present application provides an objective UAP, comprising: a sending unit, configured to send, when it is detected that the signal strength of the UE is greater than or equal to a preset threshold value, switching information to a first mobile control center MCC, where the switching information is used to request to switch the UE to a target UAP, and the target UAP is controlled by the first MCC; a receiving unit, configured to receive interest package information sent by the first MCC, where the interest package information includes a content name of a first interest package and user information of the UE, and the first interest package is an interest package that is sent by the UE to the original UAP connected to the UE and is not responded to; and the processing unit is used for modifying the first to-be-determined interest table PIT stored in the storage unit according to the interest packet information received by the receiving unit, so that when the receiving unit receives the data packet requested by the first interest packet, the sending unit sends the data packet to the UE according to the first PIT modified by the processing unit.

For technical effects of the target UAP provided in the present application, reference may be made to technical effects of the third aspect or each implementation manner of the third aspect, and details are not described here again.

In an eighth aspect, the present application provides a raw UAP, comprising: a receiving unit, configured to receive switching information sent by a mobile control center MCC that controls the original UAP, where the switching information includes a switching instruction and user information of a user equipment UE, the switching information is used to request to switch the UE to a target UAP, and the original UAP is a UAP currently connected to the UE; a processing unit, configured to query, according to the switching instruction received by the receiving unit, a second to-be-determined interest table PIT stored in the original UAP, and determine a content name of a first interest packet corresponding to the user information received by the receiving unit, where the first interest packet is an interest packet that is sent to the original UAP by the UE and is not responded to; a sending unit, configured to send the information of the first interest package determined by the processing unit to the MCC, where the information of the first interest package includes a content name of the first interest package and the user information.

Optionally, the second PIT includes a second local PIT and a second user pending interest table U-PIT, where the second local PIT is used to record a correspondence between a content name of an interest packet that the original UAP does not respond to and a transmission port, and the second U-PIT is used to record a correspondence between user information and a content name of an interest packet that the original UAP does not respond to; the processing unit queries a second to-be-determined interest table PIT stored in the original UAP according to the switching instruction, and determines the content name of a first interest packet corresponding to the user information, which specifically includes: searching the content name of the unresponsive interest package corresponding to the user information of the UE in the second U-PIT; determining that the content name of the unresponsive interest packet corresponding to the user information of the UE exists in the second local PIT, and determining that the content name of the unresponsive interest packet corresponding to the user information of the UE is the content name of the first interest packet by the original UAP.

Optionally, the receiving unit is further configured to receive disconnection information sent by the MCC; the processing unit is further configured to disconnect the connection with the UE according to the disconnection information.

Optionally, the disconnection information received by the receiving unit further includes forwarding information, and the processing unit is further configured to modify the second PIT according to the forwarding information, so that when the receiving unit receives the data packet requested by the first interest packet, the sending unit sends the data packet to the destination UAP or a content router CR according to the modified second PIT, where the CR is located on a transmission path used for transmitting the data packet to the destination UAP.

For the technical effect of the original UAP provided in the present application, reference may be made to the technical effect of the fourth aspect or each implementation manner of the fourth aspect, and details are not described here again.

In a ninth aspect, the present application further provides a first MCC, comprising: a processor, a memory, a communication interface; the memory for storing computer-executable instructions; the communication interface is used for receiving the information of the first interest packet, switching information and feedback indication information, and sending disconnection indication information, interest packet information and the like; the processor is connected to the memory and the communication interface through the bus, and when the first MCC runs, the processor executes computer execution instructions stored in the memory to implement the method for UE handover according to the first aspect and various implementations of the first aspect.

In a tenth aspect, the present application further provides a second MCC, comprising: a processor, a memory, a communication interface; the memory for storing computer-executable instructions; the communication interface is used for receiving and sending information of the first interest packet, interest packet information, switching indication information, feedback indication information, disconnection information and the like; the processor is connected to the memory and the communication interface through the bus, and when the second MCC runs, the processor executes computer execution instructions stored in the memory to implement the method for UE handover according to the second aspect and various implementations of the second aspect.

In an eleventh aspect, the present application provides a destination UAP, a processor, a memory, a transceiver; the memory for storing computer-executable instructions; the transceiver is used for receiving data packets and interest packet information and sending switching information, feedback indication information and the like; the processor, connected to the memory and the transceiver through the bus, executes the computer-executable instructions stored in the memory when the destination UAP is running, so as to implement the method for UE handover according to the third aspect and various implementations of the third aspect.

In a twelfth aspect, the present application further provides a raw UAP, including: a processor, a memory, a transceiver; the memory for storing computer-executable instructions; the transceiver is used for sending the information of the interest packet and the first interest packet and receiving switching indication information, disconnection information and the like; the processor is connected to the memory and the transceiver through the bus, and when the original UAP is running, the processor executes computer execution instructions stored in the memory to implement the method for UE handover described in the fourth aspect and the implementation manners of the fourth aspect.

In a thirteenth aspect, the present application further provides a computer storage medium having instructions stored therein, which when run on a computer, cause the computer to perform the method of the first, second, third or fourth aspect.

In a fourteenth aspect, the present application also provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first, second, third or fourth aspect described above.

In a fifteenth aspect, the present application provides a communication system comprising: a first MCC as in any alternative of the fifth aspect or the fifth aspect, and a target UAP as in any alternative of the seventh aspect, the eighth aspect, or the eighth aspect; a first MCC as described in any alternative of the ninth aspect or the ninth aspect, and a target UAP as described in any alternative of the seventh aspect, the eighth aspect, or the eighth aspect; a first MCC as described in any alternative of the fifth aspect or the fifth aspect, a target UAP as described in any alternative of the seventh aspect, the eighth aspect, or the eighth aspect, and a raw UAP as described in any alternative of the eighth aspect, the twelfth aspect, or the twelfth aspect; a first MCC as described in any alternative of the ninth aspect or the ninth aspect, a target UAP as described in any alternative of the seventh aspect, the eighth aspect, or the eighth aspect, and a raw UAP as described in any alternative of the eighth aspect, the twelfth aspect, or the twelfth aspect; a first MCC as described in any alternative of the fifth aspect or the fifth aspect, a target UAP as described in any alternative of the seventh aspect, the eighth aspect, or the eighth aspect, an original UAP as described in any alternative of the eighth aspect, the twelfth aspect, or the twelfth aspect, and a second MCC as described in any alternative of the sixth aspect, the tenth aspect, or the tenth aspect; a first MCC as described in any alternative of the ninth aspect or the ninth aspect, a target UAP as described in any alternative of the seventh aspect, the eighth aspect or the eighth aspect, an original UAP as described in any alternative of the eighth aspect, the twelfth aspect or the twelfth aspect, and a second MCC as described in any alternative of the sixth aspect, the tenth aspect or the tenth aspect.

Drawings

FIG. 1 is a schematic diagram of a prior art NDN topology;

fig. 2 is a schematic diagram of a communication system provided herein;

FIG. 3 is a schematic diagram of an MCC according to the present application;

FIG. 4 is a schematic structural diagram I of a UAP provided in the present application;

fig. 5 is a schematic structural diagram of a CR provided herein;

FIG. 6 is a schematic structural diagram of a CGW provided herein;

fig. 7 is a schematic structural diagram of a UE provided in the present application;

fig. 8 is a first flowchart of an embodiment of a method for UE handover provided in the present application;

fig. 9 is a flowchart of a second embodiment of a method for UE handover provided by the present application;

fig. 10 is a flowchart three of an embodiment of a method for UE handover provided in the present application;

fig. 11 is a fourth flowchart of an embodiment of a method for UE handover provided in the present application;

fig. 12 is a fifth flowchart of an embodiment of a method for UE handover provided in the present application;

fig. 13A is a schematic structural diagram of an MCC provided by the present application;

fig. 13B is a schematic structural diagram of an MCC provided by the present application;

fig. 13C is a schematic structural diagram of an MCC provided by the present application;

fig. 14A is a schematic structural diagram ii of a UAP provided in the present application;

fig. 14B is a schematic structural diagram of a UAP provided in the present application;

fig. 14C is a schematic structural diagram of a UAP provided in the present application.

Detailed Description

First, the terms "system" and "network" are often used interchangeably herein. The term "and" herein is merely an association relationship describing an associated object, and means that there may be three relationships, for example, a and B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

When the present application refers to the ordinal numbers "first", "second", "third" or "fourth", etc., it should be understood that this is done for differentiation only, unless it is clear from the context that the order is actually expressed.

The UE switching method is suitable for a Named Data Mobile Network (NDMN). Based on the traditional NDN, the NDMN provided by the present application is added with a Mobility Control Center (MCC), and has functions of information processing, information storage, topology management, Mobility Control management, and the like. In the present application, a distributed network topology may be employed. For example, the NDMN may include multiple domains, with network elements within each domain controlled by one MCC. The network element in each domain may include a User Attachment Point (UAP), a Content gateway-Way (CGW), a Content Router (CR), a UE, and the like. Each MCC may be connected to (i.e., in direct communication with) an MCC in a neighboring domain, or each MCC connected to the central MCC may be controlled by the central MCC in the network.

Illustratively, as shown in fig. 2, a communication system is provided for the present application. Including at least one central MCC, a plurality of CRs, and at least one Internet server. Wherein, the central MCC is connected with the MCC in each domain, and the MCC in each domain is responsible for controlling each network element in the domain. Illustratively, as shown in fig. 2, in domain 1, at least two UEs, two CRs, one other type of router (e.g., a router without content caching functionality), two UAPs, and one CGW are included. The CGW is connected to an internet server as a content outlet/inlet of the domain 1 and is connected to the CGW of the domain 2 through the CR1 in the network. The two UAPs are interconnected to enable communication and are connected to the CGW through two CRs in domain 1 and one other type of router to enable data interaction with internet servers or other domains. The two UAPs provide access services for the UEs connected to them, respectively. The MCC is connected to the CR, UAP, other type of router, and CGW in Domain 1.

The MCC is mainly responsible for information processing, information storage, topology management, and mobility control management. The information processing comprises processing user information, judging information of UAP and information of MCC, wherein the UAP and the MCC are connected with the user. The information storage comprises information of network elements such as UE, CR, CGW, UAP and the like. The topology management includes topology calculation, transmission path calculation, and the like. The mobile control management includes that according to information such as user information, information of UAP, information of MCC, topology calculation, transmission path calculation results and the like, control of each network element is realized by combining different signaling and information carried in the signaling, including UE switching, PIT modification in each network element and the like. The MCC may be a server, a cluster of servers, or a computer system having the above-described functionality.

The CR is mainly responsible for data forwarding and has a content caching function. The CR may be a router with content caching capabilities.

The UAP mainly provides access service for the UE and has a content caching function. The UAP may be a Base Station (BS) or a Base Transceiver Station (BTS) having a content buffering function. In systems using different radio access technologies, names of devices having a base station function may be different, for example, in an LTE network, the device is called an evolved node B (eNB or eNodeB), in a third generation communication (3G) network, the device is called a node B (node B), or an access device in fifth generation communication (5G), and so on.

The CGW may serve as a content entry/exit for each domain, and the contents of other domains may enter the domain in which the CGW is located through the CGW.

The internet server is used as a data source in the network, and issues a data packet of a corresponding content name based on the interest packet sent by each network element.

The Content Router (CR) is mainly responsible for data forwarding and has a Content caching function.

The UE referred to in the present application may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices, smart phones, smart watches, tablet computers or other processing devices connected to a wireless modem, and various forms of terminal devices, Mobile Stations (MSs), terminals (terminals), and so on. For convenience of description, the above-mentioned devices are collectively referred to as a UE in this application.

The network nodes UAP, CR and CGW all have a content caching function. I.e., UAP, CR, and CGW, support name routing, requesting packets (also referred to as content) corresponding to a content name (prefix) via interest packets. Each network node is provided with three data packet structures of a Content Store (CS), a Pending Interest Table (PIT) and a Forwarding Information Base (FIB). The CS is used to store the cache contents of each network node. The PIT is configured to record a content name and a transmission port (face) of an interest packet that the network node does not respond to, where the transmission port is a transmission port through which the network node receives the interest packet, that is, a source port of the interest packet. The FIB is used to record the next hop interface of the current node to the content providing node.

After a network node receives an interest packet, the CS is first queried to determine whether the CS caches a corresponding data packet. If the CS contains the data packet requested by the interest packet, a copy of the data packet is directly returned to the source port of the interest packet, and the interest packet which is responded to is discarded. If the CS does not contain the data packet requested by the interest packet, the network node continues to inquire in the PIT otherwise. If the content name of the interest packet is recorded in the PIT, it indicates that the network node has received the same interest packet and has forwarded out before this time, but does not obtain a return result. The network node needs to add the source port of the interest packet into the transmission port list corresponding to the content name, and simultaneously discard the interest packet. If the content name is not recorded in the PIT, the network node looks up the FIB. If the content name is recorded in the FIB, it indicates that the network node receives the interest packet for the first time, and at this time, the interest packet is forwarded according to the port list of the FIB (except the transmission port where the network node receives the interest packet), and a new correspondence between the content name and the transmission port is added to the PIT. When the network receives and receives the data packet corresponding to the interest packet, firstly, the data packet is searched in the CS according to the content name, and whether the data packet exists in the CS is determined. If so, the packet is discarded. If not, the corresponding content name is looked up in the PIT. If the content name exists, the data packet is sent to each transmission port corresponding to the content name recorded in the PIT, and the data packet is saved in the CS. If not, the packet is discarded.

As shown in fig. 3, an MCC provided for the present application comprises a processor, a memory, a bus, and a communication interface. The bus connects the processor, the memory, and the communication interface, and realizes data transfer between the processor, the memory, and the communication interface. For example, the processor receives a command from the communication interface through the bus, decrypts the received command, performs calculation or data processing according to the decrypted command, and implements processing of user information, topology calculation, transmission path calculation, and the like. The memory may include program modules and data modules for storing computer instructions and caching data, such as kernels (kernel), middleware (middleware), application program interfaces (AP), applications, and the like. Program modules may be comprised of software, firmware, hardware, or at least two of the same. The information interface can be connected with other network elements through wires or wirelessly for information interaction, so as to realize the control of other network elements.

As shown in fig. 4, a UAP provided by the present application includes a Remote Radio Unit (RRU), a BaseBand processing Unit (BBU), and an antenna feed system.

The RRU comprises a digital intermediate frequency module, a transceiver module, a power amplifier and a filtering module. The digital intermediate frequency module is used for modulation and demodulation, digital up-down frequency conversion, A/D conversion and the like of electromagnetic wave transmission signals, and the transceiver module completes conversion from intermediate frequency signals to radio frequency signals; and then the radio frequency signal is transmitted out through the antenna port by the power amplifier and the filtering module. The BBU is used to complete functions such as channel coding and decoding, modulation and demodulation of baseband signals, and protocol processing, and also provide an interface function with an upper network element, and complete a processing procedure of a physical layer core technology, such as Code Division Multiple Access (CDMA) in 3G and Orthogonal Frequency Division Multiplexing (OFDM)/Multiple-Input Multiple-Output (MIMO) processing in LTE. The antenna feed system mainly comprises an antenna, and may further comprise a coupler, a demultiplexer, and the like, for transmitting data between other network elements (e.g., UE, CR, MCC, and the like) and the RRU.

As shown in fig. 5, a CR provided for the present application includes: the system comprises a main control board, a bus, a plurality of interface boards and a switching network board.

The main control board is responsible for system management control, system clock and system maintenance. The main control board is connected with the interface board and the exchange network board through the system bus. The exchange network board is responsible for packet forwarding according to the received message of the stored routing table, and forwarding of IP message, protocol message and data packet message between the interface board and the interface board is realized. The interface board provides input and output ports for the CR, and receives and transmits data based on the routing table stored in the CR.

As shown in fig. 6, a CGW provided for application includes: a processor, a network interface, and a memory.

The processor is a control center of the CGW, connects various parts of the entire CGW using various interfaces and lines, and performs various functions of the CGW and processes data by operating or executing computer program codes stored in the memory and calling data stored in the memory, thereby performing overall monitoring of the CGW. The processor may comprise a digital signal processor device, a microprocessor device, an analog-to-digital converter, a digital-to-analog converter, etc., which may be capable of distributing the control and signal processing functions of the CGW according to their respective capabilities. The network interface may be used to send and receive information and to process the received information to the processor.

As shown in fig. 7, a UE provided by the present application includes a processor, a memory, and an RF circuit.

The processor is a control center of the UE device, connects various parts of the whole UE device by using various interfaces and lines, and executes various functions and processes data of the UE device by running or executing software programs and/or modules stored in the memory and calling the data stored in the memory, thereby performing overall monitoring on the UE device. The RF circuit may be used to transmit and receive information and to provide the received information to the processor for processing. Typically, the RF circuit includes, but is not limited to, an antenna, at least one Amplifier, a transceiver, a coupler, an LNA (Low Noise Amplifier), a duplexer, and the like, and communicates with other devices through a wireless communication and network. The wireless communication may use any communication standard or protocol, including but not limited to Global System for Mobile communications (GSM), General Packet Radio Service (GPRS), CDMA, Wideband Code Division Multiple Access (WCDMA), LTE, Wi-Fi, or low power Wi-Fi, and WLAN technologies.

Based on the NDMN provided in the present application, as shown in fig. 8, a flowchart of an embodiment of a method for UE handover provided in the present application is provided, where the method includes the following steps:

step 801, when the destination UAP detects that the signal strength of the UE is greater than or equal to a preset threshold value, the destination UAP sends handover information to the first MCC.

In the present application, the UAP may detect the signal strength of various UEs with which no connection is established. When the signal strength of one UE is greater than or equal to a preset threshold value, the UAP can determine that the UE needs to be switched from the original UAP currently connected with the UE to the UAP, so that the UAP provides services for the UE. The UAP may serve as a destination UAP for the UE and send handover information to the first MCC controlling the destination UAP to request handover of the UE to the destination UAP.

The handover information may include a handover instruction for indicating handover, and user information for indicating the UE. The destination UAP may send the handover information through the same message, or may send the handover instruction and the user information in the handover information through separate messages, respectively.

Step 802, the first MCC obtains information of the first interest package according to the switching information.

And the first MCC receives the switching information, and after determining that the UE needs to be switched, the information of the first interest packet corresponding to the user information of the UE can be acquired. The first interest packet is an interest packet which has been sent to the original UAP by the UE and is not responded to. The information of the first interest package may include the content name of all (one or more) first interest packages and user information of the UE. Through the information of the first interest packet, it can know which interest packets that have been sent but have not been responded to by the UE.

The interest packet that does not receive the response means that the original UAP has not received the corresponding data packet and sends the interest packet to the UE.

In step 803, the first MCC sends the interest package information to the destination UAP.

Wherein the interest package information includes a content name of the first interest package and user information of the UE. It should be noted that the interest package information may be information of the first interest package, and the first MCC may also process the first interest package to obtain the interest package.

Step 804, the destination UAP modifies the first PIT stored in the destination UAP according to the interest package information, so that when the destination UAP receives the data package requested by the first interest package, the destination UAP sends the data package to the UE according to the modified first PIT.

For example, after receiving the interest package information, the destination UAP may check whether the content name of each first interest package carried in the interest package information is recorded in the first PIT stored in the destination UAP. For each first interest package, if the content name of the first interest package is not recorded in the first PIT, the destination UAP may first check whether there is a cached data package requested by the first interest package (i.e., a data package corresponding to the content name of the first interest package) in the CS stored in the destination UAP. If the buffer memory exists, the data packet can be directly sent to the UE through the first transmission port on the destination UAP. The first transmission port is a transmission port for establishing connection between the destination UAP and the UE, and the destination UAP performs data transmission with the UE through the first transmission port.

If the CS does not cache the data packet, the destination UAP adds the corresponding relation between the content name of the first interest packet and the first transmission port in the first PIT. If the first PIT has the content name for recording the first interest packet, checking whether the transmission port record corresponding to the content name of the first interest packet comprises the number of the first transmission port. If not, the number of the first transmission port is added to the transmission port record. Then, according to the modified first PIT, when receiving the data packet requested by the first interest packet, the destination UAP may send the data packet to the UE through the first transmission port.

In one example, the first PIT stored in the destination UAP may include a first local PIT and a first U-PIT. The first local PIT is used for recording the corresponding relation between the content name of the interest packet which is not responded by the destination UAP and the transmission port, and the first U-PIT is used for recording the corresponding relation between the user information and the content name of the interest packet which is not responded by the destination UAP.

Illustratively, assume that the first local PIT is as shown in table 1:

TABLE 1

Name of content	Transmission port
		Test/video/file1/v2/s2	0,1
Test/video/file2/v1/s2	0

In Table 1, the transmission ports corresponding to the interest packet with the content name "Test/video/file 1/v2/s 2" are transmission port "0" and transmission port "1". Indicating that when the destination UAP receives a packet with a content name of "Test/video/file 1/v2/s 2", the packet is to be transmitted to the corresponding UE through transmission port "0" and transmission port "1". The transmission port corresponding to the interest packet with the content name of 'Test/video/file 2/v1/s 2' is '0'. Indicating that when the destination UAP receives a packet with a content name of "Test/video/file 2/v1/s 2", the packet is to be transmitted to the corresponding UE through the transmission port "0".

Assume that the first U-PIT is as shown in Table 2:

TABLE 2

In Table 2, the UE with the user information "FO 89E 0343123" has two unresponsive interest packages, namely, interest packages with content names "Test/video/file 1/v2/s 2" and "Test/video/file 2/v1/s 2", respectively. The UE with the user information of "A02344B 343 CF" has an unresponsive interest package with the content name of "Test/video/file 2/v1/s 2".

Suppose that the interest package information includes the content names of two first interest packages, "Test/video/file 2/v2/s 2" and "Test/video/file 2/v1/s 2", respectively, and also includes user information "B01564B 563 ZF". The UE indicating that the user information is 'B01564B 563 ZF' has two interest packages that have been transmitted to the original UAP but not responded, and the two interest packages have content names 'Test/video/file 2/v2/s 2' and 'Test/video/file 2/v1/s 2', respectively.

And after the destination UAP receives the interest packet information, the destination UAP needs to modify the first local PIT and the first U-PIT. For the first local PIT, when determining that the content name "Test/video/file 2/v1/s 2" exists in the first local PIT, the destination UAP may add the number of the first transmission port (assuming that the transmission port is "3") that establishes connection with the UE to the transmission port record corresponding to the content name "Test/video/file 2/v1/s 2". When determining that the content name "Test/video/file 2/v2/s 2" does not exist in the first local PIT, the destination UAP first checks whether a data packet with the content name "Test/video/file 2/v2/s 2" is cached in the CS, and if the data packet is not cached, the destination UAP can add the corresponding relation between the content name "Test/video/file 2/v2/s 2" and the transmission port "3" to the first local PIT. The modified first local PIT may be as shown in table 3 below.

TABLE 3

Name of content	Transmission port
		Test/video/file1/v2/s2	0,1
Test/video/file2/v1/s2	0,3
		Test/video/file2/v2/s2	3

For the first U-PIT, the destination UAP may directly add the correspondence between the content name "Test/video/file 2/v2/s 2" and "Test/video/file 2/v1/s 2" and the user information "B01564B 563 ZF" to the first U-PIT. The modified first U-PIT may be as shown in table 4 below.

TABLE 4

When the destination UAP completes the modification of the first PIT, the destination UAP may complete the handover to the UE. In one example, the destination UAP may send a handover complete message to the first MCC to inform the first MCC that the destination UAP completes the handover for the UE.

It should be noted that, with the UE switching method provided by the present application, after determining to switch the UE, the first MCC may obtain the content name of the first interest package that the UE has requested but has not responded, and then send the content name of the first interest package and the user information to the destination UAP through the interest package information, where the destination UAP modifies its PIT, so that the destination UAP can return the data package to the UE after receiving the data package requested by the first interest package, without requiring the UE to make a secondary request for the first interest package. Therefore, the request transmission times and the waiting time delay are reduced, and the data request efficiency of the UE in the switching process is improved.

In one example, if the destination UAP does not request the data packet requested by the first interest packet from the data source before receiving the information of the first interest packet, that is, a transmission path for transmitting the data packet is not formed between the data source and the destination UAP. Then, in order to ensure that the destination UAP can receive the data packet, after sending the interest packet information to the destination UAP, the network side device may further determine the transmission path, and modify the PIT of each network element on the transmission path, so that the data packet can be transmitted to the destination UAP. Then, based on fig. 8, as shown in fig. 9, after the step 803, the method further includes:

at step 805, the first MCC determines a transmission path for transmitting the data packet to the destination UAP.

For example, the first MCC may determine a data source closest to the destination UAP according to a preset network topology, and determine a transmission path for transmitting the data packet from the data source to the destination UAP. Alternatively, the first MCC may also determine, according to the network topology, that a CR exists on a transmission path for transmitting the data packet to the original UAP, where the CR can be directly or indirectly connected to the destination UAP and is closest to the destination UAP, and then the first MCC may determine, according to the network topology, a transmission path for transmitting the data packet from the CR to the destination UAP. Alternatively, when the original UAP and the destination UAP are not in the same domain, the first MCC may directly determine a transmission path for transmitting the packet from the egress CR of the domain (i.e., the CR connected to the CR or CGW in another domain) to the destination UAP according to the network topology.

In step 806, the first MCC sends first modification information to the first CR on the transmission path.

It is understood that the CR on the transmission path is the first CR, that is, there may be a plurality of first CR on the transmission path, or there may be one first CR. The first modification information received by each first CR may include a correspondence between a content name of the first interest packet and identification information of a reception object. The receiving destination is a destination to receive the data packet transmitted by the first CR on the transmission path.

For example, if the destination UAP on the transmission path receives the data packet from the first CR1, the destination UAP may be the target of the first CR2, and the first modification information received by the first CR1 may include the correspondence between the content name of the first interest packet and the identification information of the destination UAP. The first CR1 on the transmission path receives the data packet from the first CR2, then the first CR1 is the receiving object of the first CR2, and the first modification information received by the first CR2 may include the correspondence between the content name of the first interest packet and the identification information of the first CR 1.

In step 807, the first CR modifies the third PIT according to the first modification information.

For example, in connection with the example in step 806, after receiving the first modification information, the first CR1 may check whether the third PIT records the content name of the first interest package carried in the first modification information. If the content name of the first interest package is not recorded, the first CR1 may check whether there is a data package requested by the first interest package cached in the CS stored in the first CR 1. If there is a buffer, the packet may be sent directly to the destination UAP through the transport port "1" on the first CR1 (assuming that the transport port "1" of the first CR1 is the transport port connected to the destination UAP). If the CS does not cache the data packet, the first CR1 adds the corresponding relationship between the content name of the first interest packet and the port "1" in the third PIT. If the third PIT has the content name for recording the first interest packet, checking whether the transmission port record corresponding to the content name of the first interest packet includes a transmission port "1". If not, then add port "1" to the port record. Then, according to the modified third PIT, the first CR1 may send the data packet requested by the first interest packet to the UE through the transmission port "1" when receiving the data packet. If a transport port "1" is included in the transport port record corresponding to the content name of the first interest packet, the first CR1 need not modify the third PIT.

It is understood that, the way in which the other first CR on the transmission path modifies its third PIT may be referred to as the way in which the first CR1 modifies the third PIT stored in the first CR1, and is not described herein again. After receiving the data packet requested by the first interest packet, each first CR can directly or indirectly send the data packet to the destination UAP according to the modified third PIT. Wherein, indirectly sending the data packet to the destination UAP means forwarding to the destination UAP through other first CR with the destination UAP. For example, the second CR2, upon receiving the packet, may forward the packet to the destination UAP via the first CR 1.

It should be noted that, in one possible design, the above steps 805 and 806 may be performed after the first MCC obtains the information of the first interest package. For example, as shown in fig. 9, after the first MCC sends the interest packet information to the destination UAP, 805 and 806 may be directly performed, regardless of whether a corresponding transmission path already exists.

In another possible design, the first MCC may also decide whether to determine a transmission path and modify the PIT of each network element on the transmission path based on whether the destination UAP is waiting for the data packet requested by the first interest packet before receiving the information of the first interest packet. It will be appreciated that if the destination UAP is before modifying the first PIT based on the interest packet information, the content name of the first interest packet exists in the first PIT indicating that the destination UAP is waiting for the data packet to arrive. That is, a transmission path for transmitting the packet to the destination UAP has been established or is being established. If the destination UAP modifies the first PIT according to the interest packet information, the first PIT does not have the content name of the first interest packet, and the CS of the destination UAP does not cache the data packet, it indicates that the destination UAP does not have a service requesting the data packet at present, that is, there is no established transmission path. Then, based on fig. 9, as shown in fig. 10, after the step 804, the method further includes:

step 808, the destination UAP sends feedback information to the first MCC.

The feedback information is used for indicating whether the content name of the first interest packet exists in the first PIT before modification and whether a corresponding data packet is cached in the destination UAP. The feedback information may be sent to the first MCC through separate information, or may be sent to the first MCC by being carried in a handover completion message.

Based on this possible design, the step 805 may specifically include:

in step 805a, when it is determined that the feedback information indicates that the content name of the first interest packet does not exist in the first PIT before modification and the destination UAP does not buffer the data packet, the first MCC determines the transmission path.

In this possible design, the process of topology calculation and path calculation performed by the first MCC without determining a transmission path is avoided, thereby improving the switching efficiency.

The UE handover method provided in the present application is further described below with reference to two possible scenarios.

Scenario one, the UE performs handover within one domain. Namely, the original UAP and the destination UAP are in the same domain and are controlled by the first MCC. Based on scenario one, as shown in fig. 11, a flowchart of another embodiment of a method for UE handover according to the present application is shown:

step 1101, when detecting that the signal strength of the UE is greater than or equal to a preset threshold value, the destination UAP sends switching information to the first MCC, where the switching information includes a switching instruction and user information of the UE.

Step 1102, the first MCC determines the original UAP according to the user information.

In the present application, the first MCC stores information of each UAP controlled by the MCC in advance. For example, when the UAP establishes a connection with a UE, the UAP sends the UAP a connection status of the UE to the first MCC, and the first MCC records the connection status. So that the first MCC can inquire which UAP the UE is connected to by the UE through the user information of the UE.

That is, in the present application, when the UE performs intra-domain handover, the first MCC can determine, according to the user information of the UE, which UAP is the original UAP currently serving the UE.

Step 1103, the first MCC sends switching instruction information to the original UAP, where the switching instruction information includes a switching instruction and user information.

It should be noted that, after receiving the handover information, the first MCC may directly send the handover information to the original UAP as handover indication information. Or the switching information can be processed to obtain switching indication information, and then the switching indication information is sent to the original UAP.

And 1104, the original UAP queries a second PIT stored in the original UAP according to the switching instruction, and determines the content name of the first interest packet corresponding to the user information.

In the application, when the original UAP receives the switch instruction, the search operation of the content name of the unresponsive interest packet may be performed. Namely, the original UAP inquires the content name of the first interest packet corresponding to the user information in the second PIT according to the instruction of the switching instruction.

In one example, the second PIT may be a second U-PIT stored in the original UAP, and the second U-PIT is used for recording the corresponding relation between the user information and the content name of the interest package which is not responded by the original UAP. That is, the second U-PIT records the content names of the interest packets that each UE currently establishing connection with the original UAP has sent to the original UAP but has not responded to. The original UAP can directly search the content name of the interest packet corresponding to the user information through the second U-PIT to be used as the content name of the first interest packet.

In another example, the second PIT may include a second local PIT and a second U-PIT. And the second local PIT is used for recording the corresponding relation between the content name and the transmission port of the interest packet which is not responded by the original UAP.

Then, when the original UAP queries the second PIT and determines the content name of the first interest packet corresponding to the user information, the content name of the unresponsive interest packet corresponding to the user information of the UE may be first searched in the second U-PIT; judging whether the second local PIT has the content name of the unresponsive interest packet corresponding to the user information of the UE; and if so, determining that the unresponsive interest package corresponding to the user information of the UE is the first interest package.

It can be understood that, since the original UAP forwards the received data packet according to the second local PIT, the content of the second local PIT can be updated more timely than that of the second U-PIT in the process that the interest packets which are not responded by the original UAP are responded to one by one. Therefore, through the scheme that the content name of the first interest packet is determined by the second local PITT and the second U-PIT together, more accurate information of the first interest packet can be obtained.

In step 1105, the UAP sends the information of the first interest package to the MCC.

In this example, in step 1102-1105, the first MCC may obtain the information of the first interest package from the original UAP by directly sending the switching information to the original UAP.

In step 1106, the first MCC sends the interest package information to the destination UAP.

In step 1107, the destination UAP modifies the first PIT according to the interest package information.

The specific implementation process of steps 1106 and 1107 can refer to the specific implementation process of steps 803 and 804, which is not described herein again.

In step 1108, the destination UAP sends a handover complete message to the first MCC.

Wherein the handover complete message is used to notify the first MCC that the destination UAP has completed the handover to the UE. In an optional design, the handover complete message may also carry feedback information. For the description of the feedback information, reference may be made to the description in step 808, which is not described herein again.

In step 1109, the first MCC determines a transmission path for transmitting the data packet to the destination UAP.

Based on scenario one, assume that there is a CR in the domain, which is the first CR and is connected to both the original UAP and the destination UAP. It is understood that, when receiving the first interest packet and requesting the data requested by the first interest packet from the data source, the original UAP sends the first interest packet to the first CR, and the first CR forwards the first interest packet. The first CR receives and buffers the corresponding data packet after the data source responds to the first interest packet. Then, the first MCC determines that a transmission path for transmitting the data packet to the destination UAP is a transmission path from the first CR to the destination UAP.

At step 1110, the first MCC sends first modification information to the first CR on the transmission path.

At step 1111, the first CR modifies the third PIT according to the first modification information.

It should be noted that, based on the first scenario, the step 1108-1110 is an optional step, and the design manner of the step 1108-1110 in this example may specifically refer to the descriptions of the embodiments shown in fig. 9 and fig. 10, which is not described herein again.

Optionally, after receiving the handover complete message, the first MCC may further instruct the original UAP to disconnect from the UE. For example, the method may further comprise:

step 1112, the first MCC sends disconnection information to the original UAP.

The disconnection information may include a disconnection instruction for instructing disconnection and user information for instructing the UE, and the original UAP may determine to disconnect the UE according to the disconnection information. The original UAP may send the disconnection information through the same message, or may send the disconnection instruction and the user information in the disconnection information through separate messages, respectively.

And step 1113, the original UAP disconnects the connection with the UE according to the disconnection information.

It is understood that, after the original UAP disconnects from the UE, a release message may be further sent to the first MCC, so that the first MCC releases the communication established for the handover procedure. At this point, the UE completes the handover.

In one possible design, the disconnection information may also include forwarding information. Based on scenario one, the forwarding information may include identification information of the destination UAP and a content name of the first interest packet, or include identification information of the first CR and a content name of the first interest packet. The original UAP may modify the second PIT based on the forwarding information. The modification process of the original UAP to the second PIT may refer to the modification process of the target UAP to the first PIT, which is not described herein again.

It can be understood that, after the original UAP modifies the second PIT according to the forwarding information, when the original UAP receives the data packet requested by the first interest packet, the original UAP can directly send the data packet to the destination UAP according to the modified second PIT, or send the data packet to the first CR, and forward the data packet to the destination UAP by the first CR. And finally, the data packet is sent to the UE by the destination UAP.

It is worth to be noted that, based on the design, when the data packet reaches the original UAP, even if the UE is switched, the first MCC instructs the original UAP to modify the second PIT through the forwarding information, so that the original UAP can smoothly return the data packet to the UE, thereby avoiding data interruption of the UE during the switching process and realizing seamless switching.

Scenario two, the UE switches between the two domains. I.e. the original UAP is controlled by the second MCC and the destination UAP is controlled by the first MCC. Based on scenario two, as shown in fig. 12, a flowchart of another embodiment of a method for UE handover according to the present application is shown:

step 1201, when the destination UAP detects that the signal strength of the UE is greater than or equal to the preset threshold, the destination UAP sends the handover information to the first MCC.

Step 1202, the first MCC determines a second MCC according to the user information in the handover information.

In the present application, the first MCC stores information of the respective second MCCs connected thereto in advance. For example, information interaction is performed between MCCs connected to each other, and it is mutually notified which UEs access the domain controlled by the MCC. So that the first MCC can inquire the UE through the user information of the UE to access to a domain controlled by which second MCC is connected to the first MCC.

That is, in the present application, when the UE performs the cross-domain handover, the first MCC may determine the second MCC according to the user information of the UE.

Step 1203, the first MCC sends switching indication information to the second MCC.

Step 1204, the second MCC determines the original UAP according to the user information in the switching indication information.

Step 1205, the second MCC sends the switching indication information to the original UAP.

And 1206, the original UAP queries a second PIT stored in the original UAP according to the switching instruction, and determines the content name of the first interest packet corresponding to the user information.

Step 1207, the original UAP sends the information of the first interest package to the second MCC.

In step 1208, the second MCC sends the information of the first interest package to the first MCC.

It can be understood that both the handover indication information received by the second MCC and the information of the first interest packet carry user information. Therefore, after receiving the information of the first interest package, the second MCC may determine, by comparing the user information, that the information of the first interest package needs to be sent to the first MCC (i.e., the MCC that sends the same switching indication information as the user information in the information of the first interest package).

In this example, in the above-mentioned step 1202 and 1208, a procedure of sending the switching indication information to the original UAP by the first MCC via the second MCC to obtain the information of the first interest package from the original UAP is described. For the cross-domain switching of the UE, if the first MCC cannot directly determine the original UAP, the original UAP can be indicated to perform related operations by controlling the second MCC of the original UAP.

Step 1209, the first MCC sends interest package information to the destination UAP.

Step 1210, the destination UAP modifies the first PIT according to the interest package information.

The specific implementation process of steps 1209-1210 may refer to the specific implementation process of steps 803-804, which is not described herein again.

In step 1211, the destination UAP sends a handover complete message to the first MCC.

At step 1212, the first MCC determines a transmission path for transmitting the data packet to the destination UAP.

In step 1213, the first MCC sends the first modification information to the first CR on the transmission path.

Step 1214, the first CR modifies the third PIT according to the first modification information.

Optionally, based on scenario two, if the first CGW in the domain controlled by the first MCC has a cache function and a packet forwarding function, the first CGW is used as the domain exit/entry and connected to the first CR. Then, the first MCC may determine that a transmission path for transmitting the data packet to the destination UAP is a transmission path from the first CGW to the destination UAP through the first CR. Then, after step 1212, the method may further comprise:

at step 1215, the first MCC sends second modification information to the first CGW on the transmission path.

At step 1216, the first CGW modifies the fourth PIT according to the second modification information.

Wherein the second modification information includes a content name of the first interest packet and identification information of the first CR. The way in which the first CGW modifies the fourth PIT according to the second modification information may refer to the way in which the first CR modifies the third PIT according to the first modification information, which is not described herein again. According to the modified fourth PIT, the first CGW may be able to forward the data packet requested by the first interest packet to the first CR upon receiving the data packet.

It should be noted that, based on the second scenario, the step 1212-.

step 1217, the first MCC sends disconnection information to the second MCC.

The disconnection information may include disconnection instructions, user information, and forwarding information. Based on scenario two, the forwarding information may include the identification information of the first CGW and the content name of the first interest packet, or include the identification information of the first CR and the content name of the first interest packet.

If the CR is used as an exit/entry of the domain, the forwarding information includes the identification information of the first CR and the content name of the first interest packet, and after receiving the disconnection information, the second MCC may further perform the following steps:

in step 1218, the second MCC sends third modification information to the second CR according to the forwarding information.

In step 1219, the second CR modifies the fifth PIT stored in the second CR according to the third modification information.

It is to be understood that, when a CR serves as an entrance/exit of a domain, the third modification information includes identification information of the first CR and a content name of the first interest package. After the second CR modifies the fifth PIT according to the three modification information, when receiving the data requested by the first interest packet, the second CR may send the data packet to the first CR according to the modified fifth PIT, so that the first CR sends the data packet to the destination UAP through the corresponding transmission path.

Optionally, if the CGW is used as an exit/entry of the domain, the forwarding information includes identification information of the first CGW and a content name of the first interest package. After the second MCC receives the disconnection information, the second MCC may further modify PIT of the second CGW controlled by the second MCC, which includes the following specific steps:

step 1220, the second MCC sends fourth modification information to the second CGW according to the forwarding information.

Step 1221, the second CGW modifies a sixth PIT stored in the second CGW according to the fourth modification information.

When the CGW is used as an entrance/exit of the domain, the fourth modification information includes identification information of the first CGW and a content name of the first interest package. After the second CGW modifies the sixth PIT according to the four modification information, when the second CGW receives the data requested by the first interest package, the second CGW can send the data package to the first CGW according to the modified sixth PIT, so that the first CGW sends the data package to the destination UAP through the corresponding transmission path.

It is understood that if the CGW is used as the exit/entry of the domain, the third modification information includes the identification information of the second CGW and the content name of the first interest package in step 1218. And after the second CR modifies the fifth PIT according to the third modification information, according to the modified fifth PIT, the second CR can send the received data packet requested by the first interest packet to the second CGW, so that the second CGW sends the data packet to the first CGW, and then the first CGW sends the data packet to the destination UAP through a corresponding transmission path.

Step 1222, the second MCC sends the disconnection information to the original UAP.

And 1223, the original UAP disconnects the connection with the UE according to the disconnection information.

In a possible design, the disconnection information further carries fifth modification information determined by the second MCC according to the forwarding information. The fifth modification information includes identification information of the second CR and a content name of the first interest packet. And after the original UAP modifies the second PIT according to the fifth modification information, the original UAP sends the received data packet requested by the first interest packet to the second CR according to the modified second PIT. The data is forwarded to the destination UAP by the second CR through the corresponding transmission path to send the data packet to the UE through the destination UAP.

In the second scenario, based on the design, when the data packet reaches the original UAP, even if the UE is switched, the first MCC instructs the original UAP to modify the second PIT through the forwarding information, so that the original UAP can smoothly return the data packet to the UE, thereby avoiding data interruption of the UE during the switching process and realizing seamless switching.

In an example, if the first MCC cannot know the second MCC according to the user information, the first MCC may implement information interaction with the second MCC and the original UAP through the central MCC. For example, when the first MCC needs to exchange information with the second MCC and the original UAP through the central MCC, the steps in the embodiment shown in fig. 12 may be replaced as follows:

when the first MCC is performing step 1202 and 1203, it may be replaced by:

in step 1202a, the first MCC sends handover indication information to the central MCC.

Step 1202b, the central MCC determines the second MCC according to the user information in the switching indication information.

Step 1203a, the central MCC sends switching indication information to the second MCC.

When the first MCC is performing step 1208, it may be replaced by:

in step 1208a, the second MCC sends the information of the first interest package to the central MCC.

In step 1208b, the central MCC sends the information of the first interest package to the first MCC.

It can be understood that the interest package information includes user information, and the handover indication information sent by the first MCC and received by the central MCC also includes the same user information. Therefore, the central MCC can determine that the information of the first interest package needs to be sent to the first MCC by comparing the user information.

When the first MCC is performing step 1217, it may be replaced by:

step 1217a, the first MCC sends disconnection information to the central MCC.

Step 1217b, the central MCC sends the disconnect information to the second MCC.

The disconnection information includes user information, and the central MCC can determine the corresponding second MCC according to the user information, so that the disconnection information is sent to the second MCC.

As can be seen from the foregoing embodiments, with the UE switching method provided by the present application, in a switching process of the UE, the first MCC may obtain a content name of the first interest package that has been requested by the UE but has not been responded to, and then send the content name of the first interest package and user information of the UE to the destination UAP through the interest package information, so as to change the PIT of the destination UAP, so that the destination UAP can return a data package to the UE after receiving the data package requested by the first interest package. Without the UE making a secondary request for the first interest package. Therefore, the request transmission times and the waiting time delay are reduced, and the data request efficiency of the UE in the switching process is improved.

The above-mentioned scheme provided by the present application is mainly introduced from the perspective of interaction between network elements. It is to be understood that each network element, such as UAP, MCC, etc., contains corresponding hardware structures and/or software modules for performing each function in order to implement the above-described functions. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The present application may perform functional module division on UAP, MCC, etc. according to the above method examples, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the present application is schematic, and is only a logical function division, and there may be another division manner in actual implementation.

The present application may perform functional module division on the UAP, the MCC, and the like according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the present application is schematic, and is only a logical function division, and there may be another division manner in actual implementation.

In the case of dividing each function module by corresponding functions, fig. 13A shows a possible structural diagram of the UAP involved in the above embodiment, where the UAP includes: a receiving unit 1301, a processing unit 1302 and a sending unit 1303. When the UAP is an original UAP, the receiving unit 1301 is configured to support the original UAP to perform steps 1103 and 1112 in fig. 11, and steps 1205 and 1222 in fig. 12; the processing unit 1302 is configured to instruct the original UAP to perform steps 1104 and 1113, such as steps 1206 and 1223 in fig. 12; the sending unit 1303 is configured to instruct the original UAP to perform step 1105 and step 1207 in fig. 12. When the UAP is used as the destination UAP, the receiving unit 1301 is configured to support the destination UAP to perform step 803 in fig. 8-10, step 1106 in fig. 11, and step 1209 in fig. 12; the processing unit 1302 is configured to support the destination UAP to perform step 804 in fig. 8-10, step 1107 in fig. 11, step 1210 in fig. 12; the transmitting unit 1303 is configured to support the destination UAP to perform steps 801 in fig. 8-9, steps 801 and 803 in fig. 10, steps 1101 and 1108 in fig. 11, and steps 1201 and 1211 in fig. 12. All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.

In the case of integrated units, fig. 13B shows a possible structural representation of the UAP involved in the above-described embodiment. The UAP includes: a processing module 1311 and a communication module 1312. The processing module 1311 is used to control and manage the UAP action. For example, when the UAP is used as the original UAP, the processing module 1311 is configured to support the original UAP to perform steps 1103-. When the UAP is the destination UAP, the processing module 1311 is configured to enable the destination UAP to perform steps 801, 803, and 804 in fig. 8-9, steps 801, 803, 804, and 808 in fig. 10, steps 1101, 1106, and 1108 in fig. 11, steps 1201, 1209, and 1211 in fig. 12, and/or other processes for the techniques described herein. The communication module 1312 is used to support communication between the UAP and other network entities, such as the functional modules or network entities shown in fig. 2. The UAP may also include a storage module 1313 for storing program code and data for the UAP.

The Processing module 1311 may be a Processor or a controller, such as a Central Processing Unit (CPU), a general purpose Processor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The communication module 1312 may be a transceiver, a transceiver circuit or a communication interface, etc. The storage module 1313 may be a memory.

When the processing module 1311 is a processor, the communication module 1312 is a transceiver, and the storage module 1313 is a memory, the UAP referred to in this application may be the UAP shown in fig. 13C.

Referring to fig. 13C, the UAP includes: a processor 1321, a transceiver 1322, a memory 1323, and a bus 1324. Wherein the transceiver 1322, the processor 1321, and the memory 1323 are connected to each other by a bus 1324; the bus 1324 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 13C, but it is not intended that there be only one bus or one type of bus.

In the case of dividing the functional modules by corresponding functions, fig. 14A shows a schematic diagram of a possible structure of the MCC involved in the above embodiments, where the MCC includes: a transmission unit 1401, a processing unit 1402, and a reception unit 1403. When the MCC is the first MCC, the sending unit 1401 is configured to support the first MCC to perform step 803 in fig. 8, steps 803, 806 in fig. 9-10, steps 1103, 1106, 1110, and 1112 in fig. 11, and steps 1203, 1209, 1213, 1215, and 1217 in fig. 12; processing unit 1402 is configured to support the first MCC to perform step 802 in fig. 8, steps 802 and 805 in fig. 9, steps 802 and 805a in fig. 10, steps 1102 and 1109 in fig. 11, and steps 1202 and 1212 in fig. 12; the receiving unit 1403 is configured to support the first MCC to perform steps 801 in fig. 8-9, steps 801 and 808 in fig. 10, steps 1101, 1105 and 1108 in fig. 11, and steps 1201, 1208 and 1211 in fig. 12. When the MCC is used as the second MCC, the transmitting unit 1401 is configured to support the second MCC to perform steps 1205, 1208, 1218, 1220, and 1222 in fig. 12; processing unit 1402 is configured to support the second MCC to perform step 1204 in fig. 12; the receiving unit 1403 is configured to support the second MCC to perform steps 1203, 1207, and 1217 in fig. 12. All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.

In the case of integrated cells, fig. 14B shows a schematic diagram of a possible structure of the MCC involved in the above embodiments. The MCC includes: a processing module 1411 and a communication module 1412. The processing module 1411 is configured to control and manage the MCC actions. For example, when the MCC is used as the first MCC, the processing module 1411 is configured to support the first MCC to perform the steps 801-. When the MCC is used as the second MCC, the processing module 1411 is configured to support the second MCC to perform steps 1203-. The communication module 1412 is used to support communication between the MCC and other network entities, such as the functional modules or network entities shown in fig. 2. The MCC may also include a memory module 1413 for storing program codes and data for the MCC.

The processing module 1411 may be a processor or controller, such as a CPU, general purpose processor, DSP, ASIC, FPGA or other programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The communication module 1412 may be a transceiver, a transceiving circuit or a communication interface, etc. The storage module 1413 may be a memory.

When the processing module 1411 is a processor, the communication module 1412 is a communication interface, and the storage module 1413 is a memory, the MCC involved in the present application may be the MCC shown in fig. 14C.

Referring to fig. 14C, the MCC comprises: a processor 1421, a communication interface 1422, a memory 1423, and a bus 1424. The communication interface 1422, the processor 1421, and the memory 1423 are connected to each other via a bus 1424; the bus 1424 may be a PCI bus or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, fig. 14C is shown with only one thick line, but does not show only one bus or one type of bus.

The steps of a method or algorithm described in connection with the disclosure herein may be embodied in hardware or in software instructions executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in Random Access Memory (RAM), flash Memory, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), registers, a hard disk, a removable disk, a compact disc Read Only Memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in a core network interface device. Of course, the processor and the storage medium may reside as discrete components in a core network interface device.

In specific implementation, the present application further provides a computer storage medium, where the computer storage medium may store a program, and the program may include some or all of the steps in the embodiments of the UE handover method provided in the present application when executed. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a Random Access Memory (RAM).

The present application also provides a computer program product containing instructions which, when run on a computer, cause the computer to perform some or all of the steps in the embodiments of the method for UE handover provided above.

Those skilled in the art will readily appreciate that the techniques of this application may be implemented in software plus any necessary general purpose hardware platform. Based on such understanding, the technical solutions in the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a VPN gateway, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present invention.

The same and similar parts in the various embodiments in this specification may be referred to each other. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is simple, and the relevant points can be referred to the description in the method embodiment.

The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.

Claims

1. A method for switching User Equipment (UE), comprising:

a first mobile control center MCC receives switching information sent by a target User Attachment Point (UAP), wherein the switching information is used for requesting to switch UE to the target UAP;

the first MCC acquires information of a first interest packet according to the switching information, wherein the information of the first interest packet comprises a content name of the first interest packet and user information of the UE, and the first interest packet is an interest packet which is sent by the UE to an original UAP connected with the UE and is not responded;

the first MCC sends interest package information to the target UAP, wherein the interest package information comprises a content name of the first interest package and the user information, and the interest package information is used for the target UAP to modify a first to-be-determined interest table PIT stored in the target UAP, so that the target UAP sends a data package to the UE according to the modified first PIT after receiving the data package requested by the first interest package;

the original UAP and the target UAP are positioned at the upper layer of the network of the UE and are used for connecting with the UE; the first MCC is positioned at the upper network layer of the original UAP and the target UAP and is connected with the original UAP and the target UAP; the first MCC is connected with an Internet server through a content gateway CGW.

2. The method of claim 1, wherein the handover information includes the user information and a handover command, the original UAP is controlled by the first MCC, and the first MCC obtains information of a first interest package according to the handover information, including:

the first MCC determines the original UAP according to the user information;

the first MCC sends the switching indication information to the original UAP, wherein the switching indication information comprises the switching instruction and the user information, so that the original UAP determines the information of the first interest packet corresponding to the user information according to the switching instruction;

and the first MCC receives the information of the first interest packet sent by the original UAP.

3. The method of claim 2, wherein after the first MCC sends the interest packet information to the destination UAP, the method further comprises:

and the first MCC sends disconnection information to the original UAP, wherein the disconnection information is used for indicating the original UAP to disconnect the UE.

4. The method of claim 1, wherein the handover information includes the user information and a handover command, the original UAP is controlled by a second MCC, and the first MCC obtains information of a first interest package according to the handover information, including:

the first MCC determines the second MCC according to user information;

the first MCC sends the switching indication information to the original UAP through the second MCC, wherein the switching indication information comprises the switching instruction and the user information, so that the original UAP determines the information of the first interest packet corresponding to the user information according to the switching instruction;

and the first MCC receives the information of the first interest packet sent by the original UAP through the second MCC.

5. The method of claim 4, further comprising:

and the first MCC sends disconnection information to the original UAP through the second MCC, wherein the disconnection information is used for indicating the original UAP to disconnect the UE.

6. The method according to claim 3 or 5, wherein the disconnection information further comprises forwarding information, and wherein the forwarding information is used for the original UAP to modify a second PIT stored in the original UAP.

7. The method of claim 1, further comprising:

the first MCC determines a transmission path for transmitting the data packet to the destination UAP;

and the first MCC sends first modification information to a first content router CR on the transmission path, wherein the first modification information is used for indicating the first CR to modify a third PIT stored in the first CR, so that the first CR sends the received data packet to the destination UAP according to the modified third PIT.

8. The method of claim 7, wherein the original UAP is controlled by a second MCC, wherein the first MCC is configured to determine a transmission path for transmitting the data packet to the destination UAP, and wherein the method further comprises:

and the first MCC sends second modification information to a first Content Gateway (CGW) on the transmission path, wherein the second modification information is used for indicating the first CGW to modify a fourth PIT stored in the first CGW, so that the first CGW sends the received data packet to the first CR according to the modified fourth PIT.

9. The method of claim 7 or 8, wherein after the first MCC sends the interest packet information to the destination UAP, the method further comprises:

the first MCC receives feedback information sent by the target UAP, wherein the feedback information is used for indicating whether the first PIT before modification has the content name of the first interest packet or not and whether the target UAP has the cached data packet or not;

the first MCC determines a transmission path for transmitting the data packet to the destination UAP, and comprises the following steps:

and when the first MCC determines that the feedback information indicates that the content name of the first interest packet does not exist in the first PIT before modification and the destination UAP does not cache the data packet, determining the transmission path.

10. A method for switching User Equipment (UE), the method comprising:

when a target User Attachment Point (UAP) detects that the signal intensity of UE is greater than or equal to a preset threshold value, the target UAP sends switching information to a first Mobile Control Center (MCC), wherein the switching information is used for requesting to switch the UE to the target UAP;

the target UAP receives interest package information sent by the first MCC, the interest package information comprises a content name of a first interest package and user information of the UE, and the first interest package is an interest package which is sent by the UE to an original UAP connected with the UE and is not responded;

the destination UAP modifies a first to-be-determined interest table PIT stored in the destination UAP according to the interest packet information, so that when the destination UAP receives a data packet requested by the first interest packet, the destination UAP sends the data packet to the UE according to the modified first PIT;

wherein the first MCC, the original UAP, the target UAP and the UE are located in the same domain, and the first MCC controls all network elements in the domain; the original UAP and the target UAP are positioned at the upper layer of the network of the UE and are used for connecting with the UE; the first MCC is positioned at the upper network layer of the original UAP and the target UAP and is connected with the original UAP and the target UAP; the first MCC is connected with an Internet server through a content gateway CGW.

11. The method as claimed in claim 10, wherein the first PIT includes a first local PIT for recording a correspondence between a content name of the interest packet that the destination UAP does not respond to and a transmission port, and a first user pending interest table U-PIT for recording a correspondence between user information and a content name of the interest packet that the destination UAP does not respond to.

12. The method as recited in claim 10 or 11, wherein after the destination UAP modifies the first PIT stored within the destination UAP based on the information of the first interest packet, the method further comprises:

and the target UAP sends feedback information to the first MCC, wherein the feedback information is used for indicating whether the content name of the first interest packet exists in the first PIT before modification or not and whether the data packet is cached in the target UAP or not.

13. A method for switching User Equipment (UE), the method comprising:

an original User Attachment Point (UAP) receives switching information sent by a Mobile Control Center (MCC) for controlling the original UAP, wherein the switching information comprises a switching instruction and user information of User Equipment (UE), the switching information is used for requesting to switch the UE to a target UAP, and the original UAP is the UAP currently connected with the UE;

the original UAP inquires a second to-be-determined interest table PIT stored in the original UAP according to the switching instruction, and determines the content name of a first interest packet corresponding to the user information, wherein the first interest packet is an interest packet which is sent to the original UAP by the UE and is not responded;

the original UAP sends information of the first interest package to the MCC, wherein the information of the first interest package comprises a content name of the first interest package and the user information;

the MCC, the original UAP, the target UAP and the UE are located in the same domain, and the MCC controls all network elements in the domain; the original UAP and the target UAP are positioned at the upper layer of the network of the UE and are used for connecting with the UE; the MCC is positioned at the upper network layer of the original UAP and the target UAP and is connected with the original UAP and the target UAP; the MCC is connected with an Internet server through a content gateway CGW.

14. The method according to claim 13, wherein the second PIT comprises a second local PIT and a second user pending interest table U-PIT, the second local PIT is used for recording the corresponding relationship between the content name of the interest packet which is not responded by the original UAP and the transmission port, and the second U-PIT is used for recording the corresponding relationship between the user information and the content name of the interest packet which is not responded by the original UAP;

the original UAP inquires a second interest table PIT to be determined stored in the original UAP according to the switching instruction, and determines the content name of a first interest packet corresponding to the user information, wherein the content name comprises the following steps:

the original UAP searches the content name of the unresponsive interest packet corresponding to the user information of the UE in the second U-PIT;

and the original UAP determines that the content name of the unresponsive interest packet corresponding to the user information of the UE exists in the second local PIT, and the original UAP determines that the content name of the unresponsive interest packet corresponding to the user information of the UE is the content name of the first interest packet.

15. The method of claim 13 or 14, wherein after the original UAP sends the information of the first interest packet to the MCC, the method further comprises:

the original UAP receives disconnection information sent by the MCC;

and the original UAP disconnects the connection with the UE according to the disconnection information.

16. The method according to claim 15, wherein the disconnection information further includes forwarding information, and after the original UAP receives the disconnection information sent by the MCC, the method further comprises:

and the original UAP modifies the second PIT according to the forwarding information so that when the original UAP receives the data packet requested by the first interest packet, the original UAP sends the data packet to the destination UAP or a content router CR according to the modified second PIT, wherein the CR is positioned on a transmission path for transmitting the data packet to the destination UAP.

17. A first mobile control center MCC, comprising:

a receiving unit, configured to receive switching information sent by a destination user attachment point UAP, where the switching information is used to request to switch a user equipment UE to the destination UAP;

a processing unit, configured to obtain information of a first interest packet according to the switching information received by the receiving unit, where the information of the first interest packet includes a content name of the first interest packet and user information of the UE, and the first interest packet is an interest packet that is sent by the UE to an original UAP connected to the UE and is not responded to;

a sending unit, configured to send the interest package information to the destination UAP, where the interest package information includes a content name of the first interest package and the user information, and the interest package information is used for the destination UAP to modify a first pending interest table PIT stored in the destination UAP, so that after receiving a data package requested by the first interest package, the destination UAP sends the data package to the UE according to the modified first PIT;

18. The first MCC according to claim 17, wherein the switching information comprises the user information and a switching instruction, the original UAP is controlled by the first MCC, and the processing unit obtains information of a first interest packet according to the switching information, specifically comprising:

determining the original UAP according to the user information;

sending the switching indication information to the original UAP, wherein the switching indication information comprises the switching instruction and the user information, so that the original UAP determines the information of the first interest packet corresponding to the user information according to the switching instruction;

and receiving the information of the first interest packet sent by the original UAP.

19. The first MCC of claim 18,

the sending unit is further configured to send disconnection information to the original UAP after sending the interest packet information to the destination UAP, where the disconnection information is used to indicate that the original UAP disconnects from the UE.

20. The first MCC according to claim 17, wherein the switching information comprises the user information and a switching instruction, the original UAP is controlled by a second MCC, and the processing unit obtains information of a first interest packet according to the switching information, specifically comprising:

determining the second MCC according to the user information;

sending the switching indication information to the original UAP through the second MCC, wherein the switching indication information comprises the switching instruction and the user information, so that the original UAP determines the information of the first interest packet corresponding to the user information according to the switching instruction;

receiving information of the first interest packet sent by the original UAP via the second MCC.

21. The first MCC of claim 20,

the sending unit is further configured to send disconnection information to the original UAP via the second MCC, where the disconnection information is used to indicate that the original UAP disconnects from the UE.

22. The first MCC according to claim 19 or 21, wherein the disconnection information further comprises forwarding information, wherein the forwarding information is used for the original UAP to modify a second PIT stored in the original UAP.

23. The first MCC of claim 17,

the processing unit is further configured to determine a transmission path for transmitting the data packet to the destination UAP;

the sending unit is further configured to send first modification information to a first content router CR on the transmission path, where the first modification information is used to instruct the first CR to modify a third PIT stored in the first CR, so that the first CR sends the received data packet to the destination UAP according to the modified third PIT.

24. The first MCC of claim 23, wherein the original UAP is controlled by a second MCC,

the sending unit is configured to send second modification information to the first content gateway CGW on the transmission path, where the second modification information is used to instruct the first CGW to modify a fourth PIT stored in the first CGW, so that the first CGW sends the received data packet to the first CR according to the modified fourth PIT.

25. The first MCC of claim 23 or 24,

the receiving unit is further configured to receive feedback information sent by the destination UAP, where the feedback information is used to indicate whether a content name of the first interest packet exists in the first PIT before modification, and whether the data packet is cached in the destination UAP;

the determining, by the processing unit, a transmission path for transmitting the data packet to the destination UAP specifically includes:

and when the content name of the first interest packet does not exist in the first PIT before modification and the data packet is not cached in the destination UAP, determining the transmission path.

26. A destination user attachment point, UAP, comprising:

a sending unit, configured to send, when it is detected that a signal strength of a user equipment UE is greater than or equal to a preset threshold value, switching information to a first mobile control center MCC, where the switching information is used to request that the UE is switched to a target UAP;

a receiving unit, configured to receive interest package information sent by the first MCC, where the interest package information includes a content name of a first interest package and user information of the UE, and the first interest package is an interest package that is sent by the UE to an original UAP connected to the UE and is not responded to;

the processing unit is used for modifying a first to-be-determined interest table PIT stored in the storage unit according to the interest packet information received by the receiving unit, so that when the receiving unit receives a data packet requested by the first interest packet, the sending unit sends the data packet to the UE according to the first PIT modified by the processing unit;

27. The destination UAP of claim 26, wherein the first PIT comprises a first local PIT for recording correspondence between a content name and a transmission port of an interest packet that the destination UAP does not respond to, and a first user pending interest table U-PIT for recording correspondence between user information and a content name of an interest packet that the destination UAP does not respond to.

28. The destination UAP of claim 26 or 27, wherein the destination UAP further comprises, after modifying the first PIT stored in the destination UAP based on the information of the first interest packet:

29. An original User Attachment Point (UAP), comprising:

a receiving unit, configured to receive switching information sent by a mobile control center MCC that controls an original UAP, where the switching information includes a switching instruction and user information of a user equipment UE, the switching information is used to request to switch the UE to a target UAP, and the original UAP is a UAP currently connected to the UE;

a processing unit, configured to query, according to the switching instruction received by the receiving unit, a second to-be-determined interest table PIT stored in the original UAP, and determine a content name of a first interest packet corresponding to the user information received by the receiving unit, where the first interest packet is an interest packet that is sent to the original UAP by the UE and is not responded to;

a sending unit, configured to send, to the MCC, information of the first interest package determined by the processing unit, where the information of the first interest package includes a content name of the first interest package and the user information;

30. The original UAP of claim 29, wherein the second PIT includes a second local PIT for recording a correspondence between a content name of the interest packet that the original UAP does not respond to and a transmission port, and a second user pending interest table U-PIT for recording a correspondence between user information and a content name of the interest packet that the original UAP does not respond to;

the processing unit queries a second to-be-determined interest table PIT stored in the original UAP according to the switching instruction, and determines the content name of a first interest packet corresponding to the user information, and the method specifically includes:

searching the content name of the unresponsive interest package corresponding to the user information of the UE in the second U-PIT;

and determining that the content name of the unresponsive interest packet corresponding to the user information of the UE exists in the second local PIT, and determining that the content name of the unresponsive interest packet corresponding to the user information of the UE is the content name of the first interest packet by the original UAP.

31. A primary UAP according to claim 29 or 30 wherein,

the receiving unit is further configured to receive disconnection information sent by the MCC;

the processing unit is further configured to disconnect the connection with the UE according to the disconnection information.

32. The original UAP of claim 31, wherein the disconnection information received by the receiving unit further includes forwarding information,

the processing unit is further configured to modify the second PIT according to the forwarding information, so that when the receiving unit receives a data packet requested by the first interest packet, the sending unit sends the data packet to the destination UAP or a content router CR according to the modified second PIT, where the CR is located on a transmission path used for transmitting the data packet to the destination UAP.

33. A communication system, comprising:

a first MCC as claimed in any of claims 17-25, a destination UAP as claimed in any of claims 26-28 and a source UAP as claimed in any of claims 29-32.